Hi perhaps can try to see why ur supply decreased? If it's due to reduction in pumping sessions, try going back to original pump schedule even if u get less milk. I find that dragging pumps usually result in less supply.
It might also be due to food u eat.. Try to avoid milk killers such as peppermint, cabbage etc. and go for milk boosters such as fish instead.
If nothing had changed from ur confinement time, then it could be due to lack of sleep or stress (especially if u had help from confinement nanny earlier!!) In that case, just continue doing what u are doing now, dont stress, and hopefully supply would increase back :)